John Rumm wrote:

A question that sprang to mind in an idle moment....

I have noticed many of the tyre replacement shops use a typical setup
with a central compressor and receiver, feeding lots of fixed pipework
taking air round the workshop, and finally flexible hoses for the
impact drivers and other equipment that requires it. Many of these
shops are equipped with inline oilers toward the front end of the
supply, such that all the tools get an oiled air flow.

However what is going to be the long term effect (if any) on the tyres
when they also use this oiled air supply to inflate the tyre after
fitting?


I think you will find that these devices are not oilers but traps to
prevent oil from the compressor getting into the air lines.
A